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Papers
- Hubble Survey Finds Missing Matter (HubbleSite.org)
"Although the universe contains billions of galaxies, only a small amount of its matter is locked up in these behemoths. Most of the universe's matter that was created during and just after the Big Bang must be found elsewhere."
"Now, in an extensive search of the local universe, astronomers say they have definitively found about half of the missing normal matter, called baryons, in the spaces between the galaxies. This important component of the universe is known as the 'intergalactic medium,' or IGM, and it extends essentially throughout all of space, from just outside our Milky Way galaxy to the most distant regions of space observed by astronomers."
"Astronomers caution that the missing baryonic matter is not to be confused with 'dark matter,' a mysterious and exotic form of matter that is only detected via its gravitational pull." 06-08
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